Witnesses told police Ricci appeared to be racing other vehicles on Oct. 8, when he swerved illegally across the median and hit Somerville Police Officer Louis Remigio, who was off duty at the time, while riding his motorcycle on the southbound side of Interstate 95 in North Hampton.

Remigio died on Oct. 9, a few hours after Ricci's mother posted his bail.

According to a police report, witnesses said a group met at a Danvers Walmart to travel together to "Import Day" at the New England Dragway in Epping, N.H. Ricci was part of that group and was driving aggressively, the report said.

The group had missed their exit and pulled over to discuss the route, when Ricci offered to lead them to the dragway, police wrote. Witnesses who saw the group after that point told officers they appeared to be racing but officers determined the other vehicles were speeding to keep up to Ricci.

Witnesses also saw Ricci lead the group into a crossover at mile marker 8.8 at a high rate of speed, the report said.

"He used a crossover (marked closed to unauthorized vehicles) on I-95 North to make a U turn," a charging document said.

Ricci's black Mercedes hit Remigio's Harley-Davidson motorcycle and a 2009 Subaru Legacy. The Subaru rolled over, and two occupants were hospitalized. A Ford Explorer and a Ford F150 were also damaged by debris and while trying to avoid the crash.

Ricci is scheduled to be arraigned on Friday morning. He is currently out on bail.

Remigio, 55, left behind two daughters. He was laid to rest last week.